Articles | Volume 24, issue 3
Hydrol. Earth Syst. Sci., 24, 1293–1318, 2020
Hydrol. Earth Syst. Sci., 24, 1293–1318, 2020
Research article
19 Mar 2020
Research article | 19 Mar 2020

Groundwater mean residence times of a subtropical barrier sand island

Harald Hofmann et al.

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Cited articles

Almendinger, J. E. and Leete, J. H.: Regional and local hydrogeology of calcareous fens in the Minnesota River basin, USA, Wetlands, 18, 184–202, 1998. a
Atkinson, A. P., Cartwright, I., Gilfedder, B. S., Cendón, D. I., Unland, N. P., and Hofmann, H.: Using 14C and 3H to understand groundwater flow and recharge in an aquifer window, Hydrol. Earth System Sciences, 18, 4951–4964,, 2014. a
Audet, P., Gravina, A., Glenn, V., McKenna, P., Vickers, H., Gillespie, M., and Mulligan, D.: Structural development of vegetation on rehabilitated North Stradbroke Island: Above/belowground feedback may facilitate alternative ecological outcomes, Ecol. Process., 2, 2192–1709, 2013. a
Austin, M. J., Masselink, G., McCall, R. T., and Poate, T. G.: Groundwater dynamics in coastal gravel barriers backed by freshwater lagoons and the potential for saline intrusion: Two cases from the UK, J. Mar. Syst., 123–124, 19–32, 2013. a, b
Australian Bureau of Meteorology: Climate Data Online, available at: (last access: January 2019), 2017. a
Short summary
Fresh groundwater (GW) on barrier islands is affected by GW use and precipitation variability. Mean residence times (MRTs) of GW on a sand barrier island were determined. They ranged from 37 years to more than 150 years for tritium and had a much larger range (modern to 5000 years) for carbon-14. Perched aquifer systems in the unsaturated zone and peat formations around wetlands are the most likely cause of longer MRTs, as they have a significant impact on regional recharge and flow diversion.